CVE-2021-33823
mediumpriority · track · 30EPSS 0.013 · 71 %ileEUUSEPSS · scored 2026-10-27
An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012. Attacker could send a huge amount of TCP SYN packet to make web service's resource exhausted. Then the web server is denial-of-service.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33823.mdcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-33823cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021062206cnnvd
- https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriescnnvd
- https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33823.mdenisa_euvd
- https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriesenisa_euvd
- https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33823.mdExploitThird Party Advisorynvd
- https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-seriesProductVendor Advisorynvd
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